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Predistortion of electroabsorption modulators for analog CATV systems at 1.55 μm

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8 Author(s)
Wilson, G.C. ; Bell Labs., Lucent Technol., Holmdel, NJ, USA ; Wood, T.H. ; Gans, M. ; Zyskind, J.L.
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A predistortion circuit with adjustable amounts of third- and fifth-order predistortion is studied both theoretically and experimentally. The circuit is used to cancel the third- and fifth-order intermodulation distortion of a 1.55-μm integrated electroabsorption modulator/DFB laser. The CSO obtained is -61 dBc and the CTB is reduced 22.6 dB to -65 dBc. This performance is maintained after fiber amplification and propagation through 13 km of nondispersion shifted fiber due to the modulator's low chirp. Dithering of the DFB laser's injection current is employed to increase the stimulated Brillouin scattering (SBS) threshold to +13.4 dBm

Published in:

Lightwave Technology, Journal of  (Volume:15 ,  Issue: 9 )

Date of Publication:

Sep 1997

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